[Users] Receiving different VIA in INVITE and CANCEL

[Papadopoulos Georgios]

Hello,

I have an issue with some user agents, (Linksys PAP2 and Sipura 3000)
sending different Via in CANCEL than in INVITE.
Of course the result is that the caller hangs up and the callee keeps
ringing.
I tried to use
	modparam("tm", "via1_matching", 0)
but it did not solve the problem. 

I have two questions:
1. Is the via1_matching in TM working as described or is it broken?

2. What can be causing this behavior of the user agent? Not all our
users who have these user agents report this problem (actually very few
have the problem). In our lab we tried same user agent, same firmware
but could never reproduce this behavior no matter how bad we tried to
mess up their configuration. 

Any help will be greatly appreciated. Thanks.

George



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